Search found 6808 matches
- Mon Mar 11, 2024 12:40 am
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Build finished, fired up successfully. 316v plates – 10.3 cathode = 306v plate-to-cathode, 10.3v across 130R cathode resistor = 80mA, or almost exactly 100% dissipation, so that's nice. I have a LOT of noise at idle. It's not the gNFB, it's just a huge amount of gain following the Volume pot. If I g...
- Sun Mar 10, 2024 10:51 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Nice looking chassis! Are you cutting slots on the tablesaw as well? Part of me wants to make this jig, part of me is fine with Hammond chassis... https://www.youtube.com/watch?v=yrb1Oh0aJM4 Bottom line is, I only fab my own chassis if I'm working for myself. It took about two hours for this exampl...
- Sun Mar 10, 2024 4:13 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Thanks, Guy. But the cap at the input is for safety, not noise.
- Sun Mar 10, 2024 1:02 am
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
As suggested, I'd like to employ a DC blocking cap between input jack and LND150. I need a rating of 300vDC, but what capacitance, to avoid affecting the guitar signal ? And do I need non-polar, or can I get away with electrolytic? The only caps I have on hand that are small in size are a pair of 10...
- Sat Mar 09, 2024 11:39 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Yes, this is my first Liverpool-ish build.
I knocked out the chassis today, from 0.080" aluminum with 1/4"-20 rivnuts. I found the Blues Jr's PT's 20-0vAC tap is perfect for powering a 28v dial lamp.
I knocked out the chassis today, from 0.080" aluminum with 1/4"-20 rivnuts. I found the Blues Jr's PT's 20-0vAC tap is perfect for powering a 28v dial lamp.
- Sat Mar 09, 2024 4:38 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
- Sat Mar 09, 2024 1:58 am
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
I swap an old carbide blade on the table saw to cut 0.080 aluminum. Works fine, but I lack a full face shield, and deflecting aluminum chips with my face is always refreshing...
- Fri Mar 08, 2024 11:08 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Updated layout in post #1. Trimmed some fat (empty space), aiming for a compact amp: 15"w x 6"d x 2.5"h
- Fri Mar 08, 2024 4:50 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
- Thu Mar 07, 2024 9:37 pm
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
Re: 2024 Monkeymatic Liverpool (nontraditional)
Bypass cap, value to be determined at runtime.
That 50p value is on both the layout and the schematic, from the Dumble Files section...
- Thu Mar 07, 2024 5:42 am
- Forum: Technical Discussion
- Topic: 2024 Monkeymatic Liverpool (nontraditional)
- Replies: 48
- Views: 2110
2024 Monkeymatic Liverpool (nontraditional)
I had a chance to swap in an LND150 in place of 12AX7 first gain stage with no other mods in an existing build, and was happy with the results. So I'm going ahead with this Liverpool (nontraditional!) build, using LND150 as first gain stage, thereby eliminating one preamp tube. Layout first. First d...
- Fri Feb 23, 2024 5:32 pm
- Forum: Technical Discussion
- Topic: PCB for octal PP guitar amp, PCB-mounted tube sockets?
- Replies: 1
- Views: 110
PCB for octal PP guitar amp, PCB-mounted tube sockets?
Remember my failed attempts to repair a DV Mark Little 40 ? I'm looking for a solution to replace the whole circuit with something that can be mounted similarly in the non-traditional chassis. I want to find a PCB for a pair of octal power tubes and three noval preamp tubes, all with tubes-up, PCB-m...
- Thu Feb 22, 2024 3:19 am
- Forum: Technical Discussion
- Topic: DV Mark Little 40 L34 - now you've ruined everything
- Replies: 12
- Views: 456
Re: DV Mark Little 40 L34 - now you've ruined everything
Photos of main PCB, just FYI.
- Thu Feb 22, 2024 3:17 am
- Forum: Technical Discussion
- Topic: imbalance in output tube current - fender deluxe reverb
- Replies: 21
- Views: 547
Re: imbalance in output tube current - fender deluxe reverb
If the imbalance follows the tube, we know the tubes are mismatched, right?
- Thu Feb 22, 2024 2:59 am
- Forum: Technical Discussion
- Topic: imbalance in output tube current - fender deluxe reverb
- Replies: 21
- Views: 547
Re: imbalance in output tube current - fender deluxe reverb
Is this a vintage 1965 amp or a reissue? If it's really 1965, I'd be concerned the 0.1u coupling caps are leaky.